Shed Project - Texture Question

I am remodeling my shed and converting it into a bedroom. We put in another window, air conditioner unit, drywall, and lanolium flooring. I have put two layers of mud on the seems already and one more to go. None of the measurements were standard or square (which apparently is common) and the ceiling proved difficult to drywall... I would like to texture it as is instead of sanding it. Any recommendations on creating a rough texture to hide my mistakes? I am learning as I go. Is the texture created with mud? I appreciate the help!